You mean like Onlive? I tried it and the quality of the video / graphics is just awful. You need a good internet connection for the best video but even then it's nowhere near as good as generated on a real video card. Bur yes, you are right I think this 'cloud gaming' will be more popular in years to come. You could sign up with onlive and try some free demos to see what it's like for yourself.
As for gaming laptops, I have always been put off them due to the difficulty of upgrades plus if they break down, cost a fortune to repair. But if you buy one in a year or two with a high end graphics card I'm sure it should handle it.
If they do go PC / MAC only for Divinity 3 then a lot of people will be disapointed unless like I mentioned above they make two versions of the game. However this will increase costs and development time. My feeling is they will release it on PC / MAC and if costs and time allow release console versions later. Microsoft will probably rob them blind for the licencing.
